Thermal vacuum gasoil conversion to produce 85-90% diesel fractions
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Process Description Feedstock - VGO or paraffinic atmospheric residue and thermal conversion vapors are fed to fractionation column 1, where they are separated into gas, naphtha, diesel fraction, heavy gasoil and residue. The latter is fed into separator 4 together with the thermal conversion residue from separator 6 and part of the vapors from separator 3. Heavy gas oil is forcibly fed with naphtha and circulating thermal conversion residue from separator 6. The resulting mixture is heated in cracking furnace 2 and separated into vapors and residue in separator 3. The latter is fed into reactor 6, from which thermal conversion vapors and residue are removed. Thermal conversion vapors are mixed with vapors from separator 4 and ejector 7 and fed into unit 1. Thermal conversion residue is divided into balance and circulating residue. The residue from separator 4 is sent to separator 5, from which atmospheric residue and vapors are removed, which are compressed by ejector 7 using part of the vapors from separator 3.
Process features
Alternative to catalytic cracking and hydrocracking processes
Reduction of capital investments by 2-3 times
Recovery of diesel fractions of 85-90% of feedstock
Technical Specification
Feedstock - vacuum distillates, black product, straight-run paraffin atmospheric residues with a density below 920 kg/m³
Feedstock capacity: up to 1 million tons/year
Thermal conversion temperature 425-445 °C, pressure: 0.3-1.6 MPa, WHSV: 1.5-2.0 h'
Diesel fraction recovery with octane number of 40-45: up to 90%
Naphtha recovery with octane number of 100-110: 0-5%
Residue recovery: 3-7%
Gas recovery: 4.5-5.5%
Patents of the Russian Federation No. 2518103, 2670435, 2671813, 2671816, 2758360